Automatic sand sifter



G. M. KING AUTOMATIC SAND SIFTER- Filed Feb. 14 I April 27 1925 2 Sheets-Sheet 1 April 27 1926. I 1,582,474

G. M. KING 1/ AUTOMATIC SAND SIFTER Filed Feb. 14, 1925 2 Sheets-Sheet 2 Patented Apr. 27, 1.926.

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GTJ'SS M. KING, OF FLAT ROCK, NORTH CAROLINA.

AUTOMATIC SAND SIFTER.

Application filed February colnpanying drawings.

This invention relates to sifting devices,

v and particularly to devices for sifting sand.

The general object of the invention is to provide a very simple and readily operated mechanism which is particularly effectlve in.

sifting sand for the use of plasterers, bricklayers, tile setters, and foundries, all of which trades require that the sand used shall be of a unlform grade and some fine and some coarse for different kinds of work.

A further object is to provide a device of this character in which a shaking screen is used provided with means whereby vibratien is given to the screen as it is reciprocated to thereby cause the disintegration of any lumps of sand.

A still further object is to provide means whereby the amplitude of the vibrations given to the screen may be varied or adiusted.

Other objects will appear in the course'of the following description.

My invention is illustrated in the accompanying drawings, wherein Figure l is a top plan-view of a screening machine constructed in accordance with my invention Figure 2 is a side elevation thereof;

Figure 3 is a longitudinal sectional View through the-screening mechanism;

Figure 4 is a vertical fragmentary section on the line 4 4-of Figure 2;

Figure -5 is an enlarged fragmentary elevation of the rack 38 and the adjacent end of the screening frame;

Figure 6 is a fragmentary'section showing another method of connecting the screw 3 to the lever 36.

Referringbto these drawings, it will be seen that l have provided :a shaking screen which is mounted upon a base. This base may be of any suitable construction but, as illustratechconsistsof a supporting frame 10 preferably made with longitudinally extending beams and transversely extending beams or in any other suitable manner. Mounted 14, 1925. Serial No. 9,1;73.

upon this base at opposite sides thereof and extending upward therefrom :are the :supporting springs 11. These may :be either flat metal springs, coiled springs or wooden springs such as are used in :amalgamators, ore classifiers and "the like. Supported by these springs 11, which springs have rela- ,-tively enlarged heads .12 and 12 is a :sup-

porting frame 13 which may be of any suit- .able COI1StI'1lCt1OI1'2UlCl either made of iron .or wood, this frame 13 being ,plvotally connected to the head 12 by a pin, bolt or otherlike suitable member 1 f, while the forward end of the frame 13 is connected to the forwardmost pair of springs 11 by means of a :pin 14c which extends into a slot 15 formed in the head 12.

It will thus be seen that this frame 13 may be given a longitudinal reciprocating movement and that the springs 11 will yield 'to permit this movement. This frame 13 supports a downwardly and rearwardly extend ing chute 16 :having side walls 1-7. This chute and its side walls are preferably made of sheet metal. Mounted upon the frame :13

and oscillating therewith is a screen frame 18 carrying the reticulated screen 19. This screen, of course, will have a mesh suitable for the work to be done and the forward end of the screen frame is provided with the .outlet spout '20,'as shown in Figure 1,which is on a level with the screen 19so that the tailings or screenings will be discharged into and through this spout, while the sifted material as, for instance, sand will pass down through the screen 19 and onto the pan or chute 16 and be discharged at the rear .end of the machine.

The forward end ofthe screen frame is, of course, provided with a transverse bar 21 which prevents the sand or other material from moving forward off "the screen, and attached to the screen frame, as by bolts or in any other suitable manner, is the yoke 22 which is preferably made of strap iron .and which carries at its forward end the down wardly depending rounded lug or protuberant member 23.

Mounted upon the base 10 in any suitable manner as, for instance, by brackets 24 and uprights 25 is .a supporting frame having longitudinally extending members 26 braced from each other in any suitable manner, and passing through these .sills or beams is :a driving shaft 27 illustrated as having a crank 28 at one end whereby it may be operated, though power may be used to operate this shaft, as by means of the belt pulley 29. Mounted upon this shaft is the gear wheel 30 which meshes with a pinion 31 mounted upon a crank shaft supported in suitable bearings in the sills 26, and connected to this crank shaft is the connecting rod or pitman which in turn is connected to a transverse pin ti l carried by the yoke 22. This pitman 15 preferably provided with oil cups 35 whereby the bearings for the extremities of the pitman are lubricated.

It will be obvious now that a rotation of the shaft 2? will cause a reciprocation of the frame 13 and of the screen 19, but in order to give a jogging motion or vibration to the screen I provide a lever 36 which is pivotally mounted at 37 upon the sill beams 26 or in any other suitable manner, this lever at its forward end carrying a sinuous rack 38 with which the rounded protuberance 23 is adapted to coact. The forward end of this lever 36 is operatively engaged by an adjusting screw 39 carrying a collar 41-0 bearing against the lever, and this adjusting screw passes through a screw-threaded opening 41 carried upon a transverse bar l2. The upper end of this adjusting screw is pro vided with a handle whereby it may be manipulated. It will be obvious that the adjusting screw might be lined from vertical movement and have its screw-threads engaging with a nut on the lever, as illustrated in Figure 6, but the effect of this adjusting screw is to shift the toothed end of the lever up or down as desired. If the toothed end of the lever is shifted upward, then it is obvious that as the screen is moved the protuberant portion 23 which is connected to the yoke will ride over the sinuous corrugations of the rack 38 and this will give a series of vertical jolts or vibrations to the screen frame 13 and thus to the screen itself, thus shaking up the mass of sand upon the screen, breaking it up into liner particles and doing away with the necessity of stirring up this sand in order that it may pass through the screen properly. The degree of shock or jar given to the screen as it. moves forward or rearward will be regulated by turning the screw 39. If the screw 39 is turned so that the toothed portion of the rack 38 is lowered, it will be obvious that the amplitude of the vertical vibrations given to the screen will be smaller than when the rack 38 is raised. The vertical movement of the screen is permitted by reason of the slots 15 in the heads 12 and the pivotal connection of the rear end of the screen with the rear springs.

It is to be noted from Figure 1 that the screen frame 18 is preferably hinged by hinges to the frame 13. his permits the screen frame and screen to be readily changed at any time and also permits the screen frame lb to be thrown upward and over so as to discharge any material which may have caught upon the screen and which has not passed out through the spout 20.

This machine in actual practice has been found to be very effective indeed for the purpose of screening sand and, of course, the fineness of the sand screened will depend entirely upon the mesh of the screen ii), and I. contemplate that the screens shall be changed according to the work to be done. is the screen is reciprocated, the material will be shaken longitudinally on the screen and at the same time jolted vertically and the tailings or screenings, that is, those portions of the material which will not pass through the screen, will eventually pass out through the discharge spout 20, while the screened sand or other material will pass down through the screen onto the chute 1t and be discharged at the rear end of the machine.

While I have particularly designed this mechanism for the purpose of screening sand, I do not wil; to be limit d thereto as it is obvious that this motion might be used to secure a reciprocation and vertical vibration f s 1-reening and shaking tables such are used in the treatn'ient ot' ores. l urthermore, it is obvious that many changes might be made in the details of construction and arrangement of parts without departing from the spirit of the invention as defined in the appended claims.

1. A device of the character described comprising a base, a plurality of springs mounted upon the base and extending up ward therefrom, a frame mounted upon the upper ends of said springs and having limited vertical movement with relation to the upper ends of the springs, a yoke attached to the forward end of the frame, means connected to said yoke whereby the frame may be reciprocated, and means adjustable into or out of the path of movement of the yoke for giving a vertical vibration to the yoke and the frame.

A device of the character described comprising a base, a plurality of springs mounted upon the base and extending upward therefrom, a frame mounted upon the upper ends of said springs and having a limited vertical movement with relation to the upper ends of the springs, a yoke attached to the forward end of the frame, means connected to said yoke whereby the frame may be reciprocated, a downwardly yrotuberant, rounded member mounted upon the extremity of the yoke, a lever pivoted intermediate its ends and extending beneath said yoke, said lever at this end being formed with a sinuous rack over which the downwardly protubcrant member is adapted to ride as the frame is reciprocated, and means engaging the forward end of said lever whereby the lever may be adjusted.

3. A device of the character described comprising a base, a plurality of springs mounted upon the base and extending upward therefrom, a frame mounted upon the upper ends of said springs and having a limited vertical movement with relation to the upper ends of the springs, a yoke attached to the forward end of the frame, means connected tosaid yoke whereby the frame may be reciprocated, a downwardly protuberant, rounded member mounted upon the extremity of the yoke, a lever pivoted intermediate its ends and extending beneath said yoke, said lever at this end being formed with a sinuous rack over which the downwardly protuberant member is adapted to ride as the frame is reciprocated, and means engaging the forward end of said lever whereby the lever may be adjusted including an adjusting screw engaging the lever.

4. A device of the charaqter described comprising a supporting base, springs extending upwardly from the base, a frame cperatively supported upon the upper ends of said springs, the attachment of the frame to the "springs permitting limited upward movement of the frame, a yoke attached 1,0 the forward end of the frame, a driving shaft having a gear wheel thereon, a crank shaft, a pinion engaging said gear wheel and mounted on the crank shaft, a connecting rod between the crank shaft and the yoke, means for causing vertical vibrations of the frame comprising a downwardly eX- tending, rounded member mounted upon the yoke, a lever disposed below the yoke and having a sinuous rack mounted thereon with which the downwardly protuberant member is adapted to engage as the frame is reciprocated to thereby cause vertical vibrations of the frame, and an adjusting screw having engagement with the forward end of the lever.

5. A device of the character described comprising a reciprocable frame, means supporting the frame for reciprocation but permitting the frame to have limited vertical movement, a yoke attached to the forward end of the frame, means connected to said yoke whereby the frame may be reciprocated, a downwardly protuberant, rounded member mounted upon the extremity of the yoke, a lever having one end'extending beneath said yoke and at this end being formed with a sinuous rack over which the downwardly extending, protuberant member is adapted to ride as the frame is reciprocated, and means engaging said lever whereby the lever may be adjusted toward and from the path of movement of the downwardly protuberant, rounded memher.

In testimony whereof I hereunto afliX my signature.

GUSS M. KING. 

